Inclosed electric fuse



April 29, 1924.

A. L. 'EUSTICE INCLOSED ELECTRIC FUSE Original Filed June 21, 1918fade/W.

I I med .5 [102 258,

Patented Apr. 29, 1924.

UNITED STATES 1,491,905 PATENT OFFICE.

ALFRED L. nus'ricn, or EVANSTON, rumors.

INCLOSED ELECTRIC FUSE.

Original application flled June 21, 1918, Serial No. 241,115. Dividedand this application filed August 10,

1922. Serial No. 580,822.

To all whom it may concern: 1

Be it known that I, ALFRED L. EUSTICE, a citizen of the United States,residing at Evanston, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Inclosed Electric Fuses,of which the following is a specification.

This invention relates to inclosed electric fuses in which a shell orhousing is provided with an end closure that also serves for holding aterminal in place, and particularly to fuses having end closurescomposed of a plurality of separable members closing together onopposite sides of the terminal of the fuse,

and holding the same against both longitudinal and rotary movement whileconstituting a substantially continuous disk-like closure member adaptedto be clamped between the end of the shell. and a ferrule, as fully setforth in my application Serial No. 241,115, filed June 21, 1918, whichhas matured into Patent No. 1,450,029, granted March 27, 1923, whereofthis application is a division.

The present application relates specifically "to an embodiment of endclosure of the general type above described, in which the members areseparated in two intersecting planes so that one member provides notonly a 80 portion complementary to and abutting the other member, but asupport therefor; the

combined abutting and supporting member beingalso constructed in any oneof several ways for interengagement with the terminal 88 of the fuse inorder to assist in holding it in position.

In the accompanying drawings, in which three embodiments of theinvention are shown by way of illustration- Figures 1, 2, and 3 are, resectively, a s de elevation, an edge view, an a perspectlve view of aterminal constructed to be received by one form of end closing anchoringdisk, the disk being shown in diametric sec- 4 tion in Figure 1 and inelevationin Figure 2.

Figures 4, 5, and 6 are, respectively, an edge view of the disk employedin Figures 1, 2, and 3, abottom view thereof,and a view 50 of the ed ethereof opposed to the edge shown in igure 4.

Figure 7 is a perspective viewof the coacting sealing washer employed InFigures 1 to 6. 7 i0 Figures 8 and 9 are perspective views of anotherform of the invention, Fi re 8 showing the disk as seen from the unerside and with its movable member 0 en, and Fi ure 9 showing it as seenfrom t e upper si e when closed.

Figure 10 is a perspective view of a third embodiment of the invention;and

Figure 11 is a perspective view of the form of terminal used inconnection with Figure 10.

Referring to Figures 1 to 7, 1 represents a terminal having an exteriorend of knife blade form and a perforated interior end 1 to receive thefusible link. Terminal 1 is intended to be fitted to the end of acylindrical shell in a manner common and well known in inclosed electricfuses, and this end is provided with a disk 2 embracing the reduced orneck portion 1 of the terminal between the shoulders 1 and 1, said diskbeing thereafter secured to the shell by being clamped between the endthereof and a securing cap, ferrule, or the like, and being adapted byits embrace of the terminal to hold the terminal against bothlongitudinal and rotary displacement relatively to the shell.

In order that the disk 2 may be brought into and out of the describedrelation with the terminal 1, it is composed of two members 2, 2",constructed with lap joints 2, 2 at opposite ends of a diameter thereof,and preferably hinged together at 2' through one of said lap joints. Thedisk is further constructed with lugs 3 by means of which it can enterinto engagement with the end of the shell to prevent rotation thereonwhen clamped by the cap or ferrule. In order to form a more effectiveabutment for the disk 2 on the terminal 1, and at the same time toassist in sealing the joints of the disk against escape of gasesgenerated at the time of blowing of the fuse, a washer 4 having a slot 4through which it receives the terminal 1 is fitted upon the terminalabove the disk 2, the upper shoulders 1 of the terminal being recessedat 1" to receive the reduced end walls 4 of said slot and thus leave theunder surface of the washer flush with the shoulders 1.

In Figures 8 and 9, disk 5, adapted to em brace the terminal 1 similarlyto the disk 2, consists of a combined base and abutting member 5? whichhas a large central opening 5 to receive the terminal endwise, and

a reduced opening 5" which fits the width of the terminal, and a movablemember 5 pivoted at 5 to the combined base and abutting member andadapted to swing upon said pivot into and out of embracing relation tothe terminal; said movable member being recessed at 5 to lit theterminal and hold it in abutment with the wall 5 of the opening 5', andto complete therewith the opening 5 shown in Figure 9, which fits theneck 1 of the terminal.

According to Figure 10, the disk 6 is constructed with an abutting face6* and a supporting face (i which are complementary to correspondingfaces of a movable member 6 pivoted thereon at said members beingrecessed at 6 and 6*, respectively, in a mannor to it the reducedportion 7- of the terminal 7 shown in Figure 11. Said disk is furtherprovided with an impaling tongue 6 that enters transverse opening 7* inthe terminal 7 to lock the disk 6 against longitudinal movement upon theterminal. Tongue 6 is reduced beyond the shoulder 6 and a projection 6on the movable member 6 abuts said shoulder from the opposite side or"the opening 7 In using the combined end-closing and terminal fixingdisk, or combined base-memher and disk, it will be interlocked with theterminal in the manner described, then positioned upon the end of theshell 8, and then secured thereon by the screw cap or ferrule 9.

In each form of the invention above de scribed, one disk section servesas a base to which the other disk section is permanently but movablyconnected, and these disk sec tions, and particularly the portionsthereof lying outside of the terminal, are mated together by surfaces atleast some of which extend at such substantial angles to thelongitudinal axis of the terminal as to develop an efiective overlap ofthe disk sections and develop solid continuous disk portions around theterminal, which overlap and more efiectively check the escape of gas.Moreover, the disk sections not only embrace the terminal blade toresist rotation thereof, but intersect it to resist longitudinal displacement.

In the form shown in Figures 8 and 10, the disk member which serves asthe base is superficially coextensive with the entire disk except forrecesses forming a gateway permitting it to move laterally upon theblade in entering into longitudinal interlock therewith, so that theshell engaging ].ugs 3 are both on one piece, the movable disk sectionswings in laterally to close the blade-receiving gate, and complete theembrace of the blade, and the joint between the sections extends forabout a semi-diameter in a plane parallel to the face of the disk, andthence in an approximately diametric plane parallel to the axis. Theconstruction of Figure 10 diliers from that of Figure 8 in that thegateway oi Figure 10 extends through to the perimeter of the basesection 6 and admits the blade by passing the tongue (i through the eyeT, whereas in Figure 8 the base section 5 must be assembled with theblade, initially, by an endwise movement, and then by a lateral movementof the blade relatively to the disk.

I claim:

1. In a blade-terminal olosed-shell electric fuse, a disk adapted to besecured to the end of the shell and to close the same, and having acentral opening conforming to a, section of the terminal and constructedof two sections permanently united but relatively movable to open andclose said central opening; said sections admitting said terminal tosaid central opening by lateral assembly when the sections are apart,and embracing and holding the terminal against longitudinal and rotarydisplacement when they are together.

2. In a blade-terminal closed-shell electric luse, a disk adapted to besecured to the end of the shell and to close the same, and having acentral opening conforming to a section of the terminal and constructedof two sections permanently united but relatively movable to open andclose said central opening; said sections admitting said terminal tosaid central opening by lateral assembly when the sections are apart,and embracing and holding the terminal against longitudinal and rotarydisplacement when they are together; and the portions of said sectionsbeyond the sides of the terminal being mated together by lap joints.

3. In a blade-terminal closed-shell electric fuse, a disk adapted to besecured to the end of the shell and to close the same, and having acentral opening conforming to a section of the terminal and constructedof two sections permanently united but relatively movable to open andclose said central opening; said sections admitting said terminal tosaid central opening by lateral assembly when the sections are apart,and embracing and holding the terminal against longitudi- 11:11 androtary displacement when they are together; and the portions of saidsections lying outside of the central opening being mated together byoverlapping faces and abutting faces.

4. In a closed-shell electric fuse, an endclosing and terminal-holdingdisk adapted to be secured to the shell and having a central apertureshaped to conform to a section of the terminal; said disk comprising abase section constructed with a gateway communicating with said apertureand admit-tin the terminal thereto by lateral assembly, an acomplementary section forming a wall of said aperture pivoting on saidbase sect-ion to close and open said gateway and thereby confine theterminal in or release it from said aperture.

5. In a closed-shell electric fuse, an endclosing and terminal-holdingdisk adapted to be secured to the shell and having a central apertureshaped to conform to a section of the terminal; said disk comprising abase section constructed with a gateway communicating with said apertureandadmitting the terminal thereto by lateral assembly, and acomplementary section forming a wall of said aperture pivoting on saidbase section to close and open said gateway and thereby confine theterminal in or release it from said aperture; said base section andcomplementary section being mated together by abutting faces andoverlapping sliding faces.

6. In a closed-shell electric fuse, an endclosing and terminal holdingdisk adapted to be secured to the shell and having a central apertureshaped to conform to a section of the terminal; said disk comprising abase section constructed with a gateway communicating with said apertureand admiti ting the terminal thereto by lateral assembly, and acomplementary section forming a wall of said aperture pivoting on saidbase section to close and open said gateway and thereby confine theterminal in or release it from said aperture; said base section andcomplementary section being mated together by abutting faces andoverlapping sliding faces; and said base section overlapping thecomplementary section to the perimeter of the disk.

7. In a closed-shell electric fuse, an endclosing and terminal-holdingdisk adapted to be secured to the shell and having a central apertureshaped to conform to a section of the terminal; said disk comprising abase section constructed with a gateway communicating with said apertureand admitting the terminal thereto by lateral assembly, and acomplementary section forming a wall of said aperture pivoting on saidbase section to close and open said gateway and thereby confine theterminal in or release it from said aperture; said base section andcomplementary section being mated together by abutting faces andoverlapping sliding faces; the overlapping portion of the base sectionhaving a terminal impaling tongue extending into the gate thereof.

8. A combined end-closure and terminal lock for enclosed electric fuses,comprising a combined base and disk divided in a transverse planethrough a part of the thickness of the disk and having severance of onedivided part of its disk from the base member completed in a planeparallel to the face of the base member and intersecting said transverseplane; the portion of the disk thus severed being permanently butmovably mounted upon the base.

9. A combined end-closure and terminal lock for enclosed electric fuses,comprising a combined base member and disk divided in a transverse planetransversely through a part of the thickness of the disk, havingseverance of one divided part of the disk completed in a plane parallelto the face of the base member and intersecting said transverse planeand the other part of the disk left integral with the base member.

Signed at Chicago, Illinois, this 5th day of August, 1922.

ALFRED L. EUSTICE.

